Editing Mathnet (section)

==Development and production==
After a successful first season, production began on six new episodes for the second season. By the time production ended on the third season and its six episodes in 1989, Beverly Leech (Kate Monday) left, and was replaced by a new character named Pat Tuesday, played by Toni DiBuono. Production on the first six episodes with the new character commenced in 1990, and ended in 1991, in time for ''Square One TV's'' fourth season. Production on the final season and its five episodes began taping in 1991, and the last episode aired in 1992.

During production, the background music also changed. Originally, it had a synth score. Gradually, as the series progressed, it was replaced with an orchestral score.

The exterior shots of the Los Angeles police station were filmed at the former LAPD [[Highland Park Police Station]], which had closed in 1983.<ref>{{cite web|title=The Los Angeles Police Historical Society|url=http://www.lapdonline.org/history_of_the_lapd/content_basic_view/1121 |work=LAPD Online |access-date=6 April 2018}}</ref> It now houses the Los Angeles Police Museum and is located at 6045 York Boulevard.<ref>{{cite web|url=http://www.laphs.org |title=Los Angeles Police Museum |website=Los Angeles Police Museum}}</ref><ref>{{cite web|url=https://maps.google.com/maps?oe=&ie=UTF-8&q=los+angeles+police+society&fb=1&gl=us&hq=police+society&hnear=0x80c2c75ddc27da13:0xe22fdf6f254608f4,Los+Angeles,+CA&cid=0,0,16157549188208978139&ei=-2_lUefTMqjzygGik4CQDA&ved=0CDMQrwswAA|title=Los Angeles Police Museum |website=Google Maps}}</ref>

The exterior shots of the New York City police station for seasons 3 and 4 were filmed at the [[Alexander Hamilton U.S. Custom House]] in [[Lower Manhattan]]. It now houses the [[George Gustav Heye Center]] of the [[National Museum of the American Indian]] and is located at 1 Bowling Green.<ref>{{cite web|title=Alexander Hamilton U.S. Custom House|url=https://www.gsa.gov/historic-buildings/alexander-hamilton-us-custom-house-new-york-ny|work=gsa.gov|access-date=6 April 2018}}</ref><ref>{{cite web|url=https://www.google.com/maps/place/Alexander+Hamilton+U.S.+Custom+House/@40.7039989,-74.0158592,17z/data=!3m1!4b1!4m5!3m4!1s0x89c25a13e83761a3:0x9850ef769399a33d!8m2!3d40.7039989!4d-74.0136705 |title=Alexander Hamilton U.S. Custom House |website=[[Google Maps]]}}</ref> Exterior shots for the fifth and final season were filmed at the [[Brooklyn Borough Hall]].